1 files changed, 83 insertions, 0 deletions

diff --git a/libcxx/test/input.output/file.streams/fstreams/filebuf.virtuals/seekoff.pass.cpp b/libcxx/test/input.output/file.streams/fstreams/filebuf.virtuals/seekoff.pass.cpp
new file mode 100644
index 00000000000..27584caf4d4
--- /dev/null
+++ b/libcxx/test/input.output/file.streams/fstreams/filebuf.virtuals/seekoff.pass.cpp
@@ -0,0 +1,83 @@
+//===----------------------------------------------------------------------===//
+//
+// ΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚThe LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <fstream>
+
+// pos_type seekoff(off_type off, ios_base::seekdir way, 
+//                  ios_base::openmode which = ios_base::in | ios_base::out);
+// pos_type seekpos(pos_type sp, 
+//                  ios_base::openmode which = ios_base::in | ios_base::out);
+
+// This test is not entirely portable
+
+#include <fstream>
+#include <cassert>
+
+template <class CharT>
+struct test_buf
+    : public std::basic_filebuf<CharT>
+{
+    typedef std::basic_filebuf<CharT> base;
+    typedef typename base::char_type  char_type;
+    typedef typename base::int_type   int_type;
+    typedef typename base::pos_type   pos_type;
+
+    char_type* eback() const {return base::eback();}
+    char_type* gptr()  const {return base::gptr();}
+    char_type* egptr() const {return base::egptr();}
+    void gbump(int n) {base::gbump(n);}
+
+    virtual int_type underflow() {return base::underflow();}
+};
+
+int main()
+{
+    {
+        char buf[10];
+        typedef std::filebuf::pos_type pos_type;
+        std::filebuf f;
+        f.pubsetbuf(buf, sizeof(buf));
+        assert(f.open("seekoff.dat", std::ios_base::in | std::ios_base::out
+                                                       | std::ios_base::trunc) != 0);
+        assert(f.is_open());
+        f.sputn("abcdefghijklmnopqrstuvwxyz", 26);
+        assert(buf[0] == 'v');
+        pos_type p = f.pubseekoff(-15, std::ios_base::cur);
+        assert(p == 11);
+        assert(f.sgetc() == 'l');
+        f.pubseekoff(0, std::ios_base::beg);
+        assert(f.sgetc() == 'a');
+        f.pubseekoff(-1, std::ios_base::end);
+        assert(f.sgetc() == 'z');
+        assert(f.pubseekpos(p) == p);
+        assert(f.sgetc() == 'l');
+    }
+    std::remove("seekoff.dat");
+    {
+        wchar_t buf[10];
+        typedef std::filebuf::pos_type pos_type;
+        std::wfilebuf f;
+        f.pubsetbuf(buf, sizeof(buf)/sizeof(buf[0]));
+        assert(f.open("seekoff.dat", std::ios_base::in | std::ios_base::out
+                                                       | std::ios_base::trunc) != 0);
+        assert(f.is_open());
+        f.sputn(L"abcdefghijklmnopqrstuvwxyz", 26);
+        assert(buf[0] == L'v');
+        pos_type p = f.pubseekoff(-15, std::ios_base::cur);
+        assert(p == 11);
+        assert(f.sgetc() == L'l');
+        f.pubseekoff(0, std::ios_base::beg);
+        assert(f.sgetc() == L'a');
+        f.pubseekoff(-1, std::ios_base::end);
+        assert(f.sgetc() == L'z');
+        assert(f.pubseekpos(p) == p);
+        assert(f.sgetc() == L'l');
+    }
+    std::remove("seekoff.dat");
+}